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Packet number echo #351

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Packet number echo #351

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3502571
Partial commit of new header format
Feb 28, 2017
af26074
initial packet number echo suggestion
britram Mar 1, 2017
1ecfd4f
one and two byte variants as well
britram Mar 2, 2017
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13 changes: 8 additions & 5 deletions draft-ietf-quic-transport.md
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Original file line number Diff line number Diff line change
Expand Up @@ -447,7 +447,7 @@ decryption. These packets contain:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Packet Number (1/2/4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Packet Number Echo (optional) |
| [Packet Number Echo (1/2/4)] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Payload ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Expand All @@ -472,7 +472,9 @@ this version, it contains:
* 01: 1-RTT packet (packet number size = 1)
* 02: 1-RTT packet (packet number size = 2)
* 03: 1-RTT packet (packet number size = 4)
* 07: 1-RTT packet (packet number size = 4, with packet number echo)
* 05: 1-RTT packet (packet number size = 1, packet number echo size = 1)
* 06: 1-RTT packet (packet number size = 2, packet number echo size = 2)
* 07: 1-RTT packet (packet number size = 4, packet number echo size = 4)
* Octets 1-2/3/4 or 9-10/11/12: Packet Number (lower 8, 16, or 32 bits)
* Octets 13-16, if present: Packet Number Echo
* Remainder of this packet: Payload.
Expand Down Expand Up @@ -610,10 +612,11 @@ equivalent to present techniques using TCP sequence and acknowledgement numbers
and/or timestamps.

The Packet Number Echo field SHOULD be present on 1-RTT packets containing at
least one ACK frame (see {{frame-ack}}); if no packet with a Packet Number Echo
least one ACK frame (see {{frame-ack}}). If no packet with a Packet Number Echo
field has been sent within the last round-trip time, the Packet Number Echo
field MUST be present.

field MUST be present. When present, the Packet Number Echo field MUST be at
least the size of the Packet Number field on the packet whose Packet Number is
being echoed.

## Frames and Frame Types {#frames}

Expand Down